Mushroom-bullet.



sTATEs FRANK o. HCAGLAND, or BRIDGEPCRT, CONNECTICUT, AssIGN-CR To UNIo-N METALLIC CARTRIDGE COMPANY, 0F BRIDG-EPORT, CONNECTICUT, A CORPORATION OF CON'- MUSHROOM-BULLET.

Specification of Letters Patent.

Patented June 9, 1914.

Application led February 24, 1914. l Serial No. 820,623.

To all 'whom 'it may concern.'

Be it known that I, FRANK O. HOAGLAND, a citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement in Mushroom-Bullets, (Gase 0,) of which the following is a specication.

This invention .relates to full covered or jacketed bullets of the class in which the body cover and the tip cover are made separate, and has for its object to provide a bullet having a novel tip cover so constructed that .while the bullet shall retain the ordinary properties of covered or jacketed bullets, it will mushroom, z'. c. flatten out,

upon impact with an objective. `This result I accomplish by` stretching and thus thinning and weakening the metal ofthe tip" cover by forming grooves therein, either longitudinally or with a slight twist to correspond with the grooves of a rifle barrel.

In the accompanying drawing forming a part of this specifica-tion, Figure-l is an elevationof a form of my novel bullet in which the tip `cover yis stretched and weakened by means of series of longitudinal grooves, rolled into the core, which run out well toward the point/of the bullet; Fig. 2.a view of my novel bullet partly in elevation and partly in longitudinal section; Fig. 3 a cross section on the line 3-3 in Fig. 2, looking in the direction of the arrows; Fig;V 4 an elevation illustrating a form inwhiclithe grooves are given a slight twist; Fig. 5 an elevation illustrating a form in which the grooves extend back to the rear end of the tip cover; Fig. 6 a. partial sectional view illustrating a mode of retaining the tip in engagment with Vthe core without struck-1n holding points, and Fig. 7 is a view showing the bullet mushroomed by impact with an objective.

20 denotes the Vcore of myv novel bullet which is made of relatively soft metal, 21 the body cover and 22 the tip cover.

rlhe gist of the invention lies in thinning and weakening the metal of the tip cover by forming grooves therein in the direction of its length, but without slitting it or forming openings therein, so that the forward end of the bullet will readily mushroom upon impact. This weakening of the tip cover is effected after itis seated on the tapering portion of the Vbullet by swaging, rolling or otherwise forming therein longitudinal grooves 23, the metal of the tip cover being rolled into the metal of the core. In the form illustrated in Figs. l and 3 the grooves do not extend back to the rear end of the tip cover and the tip cover is shown as not eX- tending, quite to the body cover, leaving a zone 24 of the metal of the core exposed between the tipcover and the body cover.

In t-he form illustrated in Fig. 2, the forward end of the body cover is set inward slightly and the rear end of the tip cover overlaps it, as at 25, leaving a smooth joint on the outer side.

The form illust-rated in Fig. 4 differs in thaty the grooves 26 are given a slight twist to correspond with the grooves of a rifie barrel.

The form illustrated in Fig. 5 corresponds Ywith the form in Fig. l, except that the grooves 27 extend back to the rear end of the tip cover and the tip cover abuts against the body cover, as at 28.

In all of the forms above described, holding points 33 may be struck out from the metal of the tip and forced into the core in order to prevent the possibility of the tip cover becoming detached therefrom.

In Fig. 6, I have shown the tip Cover as retained in place without the use of holding points. In this form the rear end of the tip cover is set inward slightly and the forward end of the body cover overlaps it as at 34. Asthe rear end of the tip cover tapers outward slightly and the forward end of the body coverV tapers inward slightly, it follows that the inwardly tapering forward end of the body cover will lock the tip cover in place.

. The effect produced by stretching and thus Vthinning and weakening the metalV of the tip cover by forming grooves therein is to insure that upon impact of the bullet,with an objective, the tip cover will open out and ordinarily be ruptured and the entire forward end of the bullet will mushroom, substantially as indicated in Fig. l1.

Having thus described my invention I claim:

l. A bullet of the character described having its tip cover stretched and weakened by forming therein a plurality of grooves the direction of its length.

ing its tip cover stretched and weakened by and' means for retaining the tip cover in forming therein a plurality of grooves, said place.

grooves having a slight twist imparted In testimony whereof I affix my signature thereto to correspond With the grooves of in presence of two witnesses. 5 a rifle barrel.

FRANK O. HOAGLAND. 8. A bullet of the character described hav- Witnesses: ing a ti cover formed With alternate spiral WILLIAM M. THOMAS, ribs an grooves, for the purpose set forth, EDWARD H. ALLEN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

` Washington, D. C. 

